//******************************************************************
//******************************************************************
//**********          ANts Peer To Peer Sources        *************
//
// ANts P2P realizes a third generation P2P net. It protects your
// privacy while you are connected and makes you not trackable, hiding
// your identity (ip) and crypting everything you are sending/receiving
// from others.

// Copyright (C) 2004  Roberto Rossi

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.


package ants.p2p.utils.addresses;

import java.io.*;
import java.util.*;
import java.net.*;

public class InetAddressWatchdog {

  static InetAddressWatchdog instance = null;

  ArrayList addresses = new ArrayList();

  public static InetAddressWatchdog getInstance(){
    if(instance == null)
      return instance = new InetAddressWatchdog();
    else
      return instance;
  }

  public void loadFilterFile(String fileName){
    this.addresses = new ArrayList();
    try {
      File file = new File(fileName);
      if (!file.exists())throw new Exception("File doesn't exist");
      FileReader fr = new FileReader(file);
      BufferedReader br = new BufferedReader(fr);
      String currentLine = null;
      while((currentLine = br.readLine()) != null){
        if(currentLine.charAt(0) == '#') continue;
        else{
          String[] initAddress = currentLine.split("[-]");
          String[] finalAddress = initAddress[1].split("[,]");
          this.addresses.add(new InetAddressRange(initAddress[0],finalAddress[0]));
        }
      }
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  InetAddressWatchdog() {}

  public boolean allowedAddress(String ip) throws Exception{
    ip = java.net.InetAddress.getByName(ip).getHostAddress();
    for(int x = 0; x < this.addresses.size(); x++){
      InetAddressRange iar = (InetAddressRange)this.addresses.get(x);
      if(iar.isInRange(ip)) return false;
    }
    return true;
  }
}
